Expansion-reamer



(No Model.)

EXPANSION EEAMEE.

No. 569,303. Patented Oct. 13, 1896.

, A C 625W l E UNITED STATES PATENT OFFICE.

JoSEPII SINGER, loF Los ANGELES, CALIFORNIA.

EXPANSION-READ!! ER.

SPECIFICATION forming part of Letters Patent No. 569,303, dated October 13, 1896.

Application filed December 23, 1893. Serial No. 494,507. (No model.)

To @ZZ whom, t may concer/L.-

Be it known that I, JOSEPH SINGER, a citizen of the United States, residing at Iios Angeles, in the county of Los Angeles and State of California, have invented a new and useful Improvement in Expansion-Beamers, of which the following is a speciiication.

My invention relates more particularly to that class of eXpansion-reamers which are used to ream gun-barrels to produce the sized bore desired.

The object of my invention is to produce an eXpansion-reamer of superior simplicity and of very few parts and of very rigid construction which can be accurately adjusted to the size of bore desired while in the bore of the gun as well as while out of the bore, so that the workman can conveniently and accurately ream any desired pocket-choke or taper-choke as well as an ordinary chokebore and can change the bore anywhere desired inside the barrel without withdrawing' the tool.

Another object of my invention is to make a practical tool of this kind in which the bits can be more easily removed for sharpening and replacing than in any other reamer before known. Vith my reainer any bit can be taken out and replaced practically inst-anta neously and no time is lost in adjustment.

The accompanying drawings illustrate my invention.

Figure l is a fragmental side elevation of my improved reamer. Fig. 2 is a longitudinal mid-section on line 2 2, Fig. l, the operating-rod not being shown. Fig. 3 is a crosssection on lines 3 3, Figs. 1 and 2. Fig. 4 is a view of the stock with the bits removed therefrom. Fig. 5 is a view of the bit-operating bolt removed from the stock. Fig. 6 is a side elevation of one of the bits removed from the stock. Fig. 7 is a longitudinal section showing the tool in a gun-barrel ready for making a pocket-choke bore.

A represents the stock, which is provided with an internal axially-arranged cylindrical chamber B and with a series of bit-slots C, opening into or communicating with such chamber and arranged longitudinally of the stock. The stock A is intern allyscrew-threaded at b at one end of the internal chamber B.

D is the bit-operating bolt, which is provided with inclined bit-en gagin g faces d, and as shown in the drawings the body of this bolt is provided with two spindle-shaped sections or swells d' d and has one end c screwthreaded to screw into the screw-threaded portion b of the chamber B.

E represents the bits, which are made of hardened steel and are provided with inclined boltengaging faces e e', which are arranged to rest upon the bit-operating faces CZ of the bolt D when the bits are in place in the slots C in the bit-stock, as shown in Figs. l, 2, and 3.

One end of the bit-stock A is provided with a socket A', adapted to receive the shank of the rod F by which the reamer is operated when in use.

In order to prevent the bits E from tilting out of the slots C in the bit-stock when starting the reamer into the barrel, I provide the end walls at the ends of such slots with inclined faces c c', which are arranged inclined at corresponding angles toward the front end a' of the stock, and I bevel the ends of the bits E to form the inclined faces e e, arranged, respectively, to lit against the inclined faces c c at the ends of the slots Cf.

The bits are slightly tapering toward the front end of the reamer, as illustrated in Fig. l, in order to allow the reamer to easily enter the hole to be reamed and also to give the proper taper to the muzzle of the barrel of the gun to give the choke desired.

It is essential to the good shooting properties of the gun that the bore of the barrel be perfectly smooth. In Order to ream the bore perfectly smooth, it is necessary that thel bit shall cut a Shaving of considerable width. Superior effects are obtained by making the bits of considerable length and so arranging them that each bit operates to cut along its entire length, and when this is done the strain upon the bit is very severe. By slotting the bit-stock and arranging the bits in the slots the bits are thus supported along their entire length, and since the bits are tapered toward the front end and the beveled rear ends of the bits are inserted beneath the inclined faces c it is practically impossible for the bits to slip or shift under the most severe strain and to thus produce inequalities in the bore of the barrel and impair the shooting qualities of the gun. By providing the stock with the IOO rear inclined faces c and the axially-arranged chamber screw-threaded at one end and providing the bit-operating bolt with the two spindle-shaped sections or swells d' d, which are of such diameter that they ll the chamber and rest against the sides of the chamber, as shown in Fig. 3, the bolt, the bits, and the stock mutually support each other when the reamer is in use, and great strength and compact-ness is thereby secured, enabling me to make an operative reamer of great length and small diameter.

The bolt D is provided at its front end with a screw-driver slot CV, by which it can be turned by a screw-driver G, inserted into the bore while the reamer is at any distance within the bore, and the tool is thus adapted to be adjusted at any time and at any place within the barrel H.

In practice, to expand the reamer the bitoperating bolt D is screwed into the screwthreaded chamber d" to bring the inclined faces d of the bolt against the inclined faces e e' of the bits, thus forcing the bits outward to cause them to rea'm the barrel, tc., to the size desired.

Then the bits are thus forced outward by the operation of the boltD,they are also forced forward by the inclined faces e of the bits acting against the inclined faces c at the ends of the slots C. During this movement the inclined supporting-faces c', upon which the front ends of the bits rest, allow the bits to move forward and outward and they continue to support the bits throughout the entire movement thereof. These front inclined bitsupporting faces or walls c' sustain the inward thrust of the bits while the tool is in operation in the act of reaming and the rear faces resist the rearward thrust of such bits; but neither of these supporting-faces interfere with the outward adjustment of the bits when the bit-operatin g bolt is turn ed to force the bits outward.

lVhen the reamer is adjusted to ream the opening to the size desired, it is started into the barrel or other opening and is rotated by means of the rod F, while pressure is applied to force the reamer forward, thusdriving the cutting edges of the bits against the material and causing them to cut a shaving of a width substantially equal to the length of the bit and leaving the bore perfectly smooth and true. The pressure against the bits as the tool is inserted tends to bind the bits more firmly in the sockets formed by the slots and the inclined faces c of the rear end walls of the slots. The bits are accurately fitted in the slots and the friction between the bits and the slots is sufficient to hold the bits in the slots when the tool is outside of the gunbarrel, but the workman can withdraw any bit by pulling outward upon the front end of the bit. Vhen the tool is inserted into the bore of the barrel H, the barrel prevents the front ends of the bits from being drawn out, and the inclined rear faces or endwalls of the slot-s which overhang the sloping rear ends of the bits prevent the rear ends of the bits from being withdrawn.

Now, having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The eXpansion-reamer for reaming gunbarrels set forth comprising the bit-stock provided wit-h an aXially-arran ged cylindrical stock and terminates in a screw-threaded socket at the rear end of the stock, and longitudinal slots opening through the stock into such chamber and having the rear and front walls of the slots inclined outward at corresponding angles toward the front end of the stock; the bit-operating bolt having inclined bit-engaging faces and screw-threaded at its rear end and arranged in such chamber with its screw screwed into the screw-socket; the bits arranged one in each of the slot-s in the stock and provided with inclined faces resting upon the spindle-shaped body of the bitoperating bolt, andA having their rear and front ends beveled to fit the inclined rear and front walls of the slots.

2. The combination of the stock provided with an axially-arranged chamber and with the longitudinal slots opening into such charnber; the rear and front end walls of such slots being inclined at corresponding angles toward the front end of theV bit-stock; the rod fastened to the stock to rotate the same; the bitoperating bolt arranged in the chamber and provided with the inclined bit-engaging faces; the bits arranged one in each of the slots in the bit-stock and each having its ends inclined to fit the inclined faces of the end walls of the slot and having its inner face arranged to rest upon the inclined face of the bitbperating bolt, and suitable meansfor operating the bolt.

JOSEPH SINGER.

Vitnesses:

JAMES R. TowNsnNn, F. M. TowNsnND.

'chamber which opens at the front end of the roo 

